# import matplotlib.pyplot as plt
# import numpy as np
# import pandas as pd
# plt.figure(figsize=(4,6),facecolor='white')
# plt.title('chengji',loc='center',fontsize=12)
# x=np.arange(1,6)
# y=np.array([30,40,60])
# plt.xlabel("x")
# plt.ylabel("y")
# plt.rcParams['font.sans-serif']='SimHei'
# plt.rcParams['axes.unicode_minus']=False
# for a,b in zip(x,y):
#     plt.text(x=a,y=b,s=b,fontsize=12,ha='left',va='center')
# plt.grid(axis='both')
# plt.plot(x,y)
# plt.show()

